we have open evenings and open mornings. they tend to be in June /July and in Sept /Oct.
ds is in year 5. We went to 3 open evenings at beginning of year 5 to have a look. That actually started us on a totally unexpected route, towards taking the 11+ for a Grammar school across the county boundary.
Open evenings are a presentation and a look around the school, uusually with activites in different areas.
Open days/mornings are with the school in full flow.
We are heading off to 2 open mornings in June, at 2 likely schools. I have already seen 2 schools will have open evenings/days in sept, so we will visit them then. Some of these are repeat visits to same schools (but now we will go during the day and see the school in action)
Days/mornings are much better as the school is in action, but it can be hard to justify too many days off school too early! Which is why we went to evenings first. It is a hard choice for us here, and I couldn't wait until Sept to see and then put in an application in Oct. We started looking because one school sent home invitations to Year 5 students.